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Originally Posted by Nautilus
1. Working by hand, with no wind tunnel or other aero instrument, it's pretty hard to reproduce the Porsche design.
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I am not sure why you say that, unless you choose to proceed in the dark. Lots of aero data can be cheaply, easily and accurately measured without a wind tunnel.
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If deflectors before front wheels really give a delta Cd of 0.01, this drops the overall Cd from 0.32 in the 0.28 range, which is actually very good for a daily-driven car.
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You cannot just ascribe Cd reductions to a car based on what the change did on another car. (Same as you cannot just add Cd reductions together to get an assumed total reduction.)